- Qt 6.9
- Qt Qml
- Integrating QML and JavaScript
- List of JavaScript Objects and Functions
- Qt 6.9.0 Reference Documentation

QML Global Object ◦ Writing QML Modules

# List of JavaScript Objects and Functions

This reference contains a list of objects, functions and properties supported by the JavaScript engine in Qt. For a detailed description, see the ECMA-262 specification.

## The Global Object

### Value Properties

- NaN
- Infinity
- undefined

### Function Properties

- eval(x)
- parseInt(string, radix)
- parseFloat(string)
- isNaN(number)
- isFinite(number)
- decodeURI(encodedURI)
- decodeURIComponent(encodedURIComponent)
- encodeURI(uri)
- encodeURIComponent(uriComponent)
- escape(string)
- unescape(string)

### Constructor Properties

- Object
- Function
- Array
- ArrayBuffer
- String
- Boolean
- Number
- DataView
- Date
- Promise
- RegExp
- Map
- WeakMap
- Set
- WeakSet
- SharedArrayBuffer
- Symbol
- Error
- EvalError
- RangeError
- ReferenceError
- SyntaxError
- TypeError
- URIError

### Other Properties

- Atomics
- Math
- JSON
- Reflect
- Proxy

## The Object Object

### Object Constructor

#### Function Properties

- getPrototypeOf(O)
- setPrototypeOf(O, P)
- getOwnPropertyDescriptor(O, P)
- getOwnPropertyDescriptors(O)
- getOwnPropertyNames(O)
- getOwnPropertySymbols(O)
- assign(O [, Properties])
- create(O [, Properties])
- defineProperty(O, P, Attributes)
- defineProperties(O, Properties)
- entries(O)
- is(V1, V2)
- keys(O)
- values(O)
- seal(O)
- isSealed(O)
- freeze(O)
- isFrozen(O)
- preventExtensions(O)
- isExtensible(O)

### Object Prototype

#### Function Properties

- toString()
- toLocaleString()
- valueOf()
- hasOwnProperty(V)
- isPrototypeOf(V)
- propertyIsEnumerable(V)
- __defineGetter__(P, F)
- __defineSetter__(P, F)

## Function Objects

### Function Prototype

#### Function Properties

- toString()
- apply(thisArg, argArray)
- call(thisArg [, arg1 [, arg2, ...]])
- bind((thisArg [, arg1 [, arg2, …]])
- [Symbol.hasInstance](O)

## Array Objects

### Array Prototype Object

#### Function Properties

- toString()
- toLocaleString()
- concat([item1 [, item2 [, ...]]])
- copyWithin([item1 [, item2 [, ...]]])
- entries()
- fill(item [, index1 [, index2]])
- join(separator)
- find(callbackfn [, thisArg]) // ECMAScript 6: Added in Qt 5.9
- findIndex(callbackfn [, thisArg]) // ECMAScript 6: Added in Qt 5.9
- includes(item)
- keys()
- pop()
- push([item1 [, item2 [, ...]]])
- reverse()
- shift()
- slice(start, end)
- sort(comparefn)
- splice(start, deleteCount[, item1 [, item2 [, ...]]])
- unshift([item1 [, item2 [, ...]]])
- indexOf(searchElement [, fromIndex])
- lastIndexOf(searchElement [, fromIndex])
- every(callbackfn [, thisArg])
- some(callbackfn [, thisArg])
- forEach(callbackfn [, thisArg])
- map(callbackfn [, thisArg])
- filter(callbackfn [, thisArg])
- reduce(callbackfn [, initialValue])
- reduceRight(callbackfn [, initialValue])
- values()
- [Symbol.iterator]()

## String Objects

### String Prototype Object

#### Function Properties

- toString()
- valueOf()
- charAt(pos)
- charCodeAt(pos)
- codePointAt(pos)
- concat([string1 [, string2 [, ...]]])
- endsWith(searchString [, endPosition ]) // ECMAScript 6: Added in Qt 5.8
- includes(searchString [, position ]) // ECMAScript 6: Added in 5.8
- indexOf(searchString ,position)
- lastIndexOf(searchString, position)
- localeCompare(that)
- match(regexp)
- normalize()
- padEnd(length [, string])
- padStart(length [, string])
- repeat(count) // ECMAScript 6: Added in Qt 5.9
- replace(searchValue, replaceValue)
- search(regexp)
- slice(start, end)
- split(separator, limit)
- startsWith(searchString [, position ]) // ECMAScript 6: Added in Qt 5.8
- substr(start, length)
- substring(start, end)
- toLowerCase()
- toLocaleLowerCase()
- toUpperCase()
- toLocaleUpperCase()
- trim()
- [Symbol.iterator]()

Additionally, the QML engine adds the following functions to the `String` prototype:

- string::arg()

## Boolean Objects

### Boolean Prototype Object

#### Function Properties

- toString()
- valueOf()

## Number Objects

### Number Prototype Object

#### Function Properties

- toString(radix)
- toLocaleString()
- valueOf()
- toFixed(fractionDigits)
- toExponential(fractionDigits)
- toPrecision(precision)

Additionally, the QML engine adds the following functions to the Number prototype:

- fromLocaleString(locale, number)
- toLocaleCurrencyString(locale, symbol)
- toLocaleString(locale, format, precision)

### The Number Object

#### Value Properties

- NaN
- NEGATIVE_INFINITY
- POSITIVE_INFINITY
- MAX_VALUE
- MIN_VALUE
- EPSILON // ECMAScript 6: Added in Qt 5.8
- MAX_SAFE_INTEGER
- MIN_SAFE_INTEGER

#### Function Properties

- isFinite(x) // ECMAScript 6: Added in Qt 5.8
- isInteger(x)
- isSafeInteger(x)
- isNaN(x) // ECMAScript 6: Added in Qt 5.8

## The Math Object

### Value Properties

- E
- LN10
- LN2
- LOG2E
- LOG10E
- PI
- SQRT1_2
- SQRT2

### Function Properties

- abs(x)
- acos(x)
- acosh(x)
- asin(x)
- asinh(x)
- atan(x)
- atanh(x)
- atan2(y, x)
- cbrt(x)
- ceil(x)
- clz32(x)
- cos(x)
- cosh(x)
- exp(x)
- expm1(x)
- floor(x)
- fround(x)
- hypot(x, y)
- imul(x, y)
- log(x)
- log10(x)
- log1p(x)
- log2(x)
- max([value1 [, value2 [, ...]]])
- min([value1 [, value2 [, ...]]])
- pow(x, y)
- random()
- round(x)
- sign(x) // ECMAScript 6: Added in Qt 5.8
- sin(x)
- sinh(x)
- sqrt(x)
- tan(x)
- tanh(x)
- trunc(x)

## Date Objects

### Date Prototype Object

#### Function Properties

- toString()
- toDateString()
- toTimeString()
- toLocaleString()
- toLocaleDateString()
- toLocaleTimeString()
- valueOf()
- getTime()
- getFullYear()
- getUTCFullYear()
- getMonth()
- getUTCMonth()
- getDate()
- getUTCDate()
- getDay()
- getUTCDay()
- getHours()
- getUTCHours()
- getMinutes()
- getUTCMinutes()
- getSeconds()
- getUTCSeconds()
- getMilliseconds()
- getUTCMilliseconds()
- getTimeZoneOffset()
- setTime(time)
- setMilliseconds(ms)
- setUTCMilliseconds(ms)
- setSeconds(sec [, ms])
- setUTCSeconds(sec [, ms])
- setMinutes(min [, sec [, ms]])
- setUTCMinutes(min [, sec [, ms]])
- setHours(hour [, min [, sec [, ms]]])
- setUTCHours(hour [, min [, sec [, ms]]])
- setDate(date)
- setUTCDate(date)
- setMonth(month [, date])
- setUTCMonth(month [, date])
- setYear(year)
- setFullYear(year [, month [, date]])
- setUTCFullYear(year [, month [, date]])
- toUTCString()
- toGMTString()
- toISOString()
- toJSON()
- [Symbol.toPrimitive](hint)

Additionally, the QML engine adds the following functions to the Date prototype:

- timeZoneUpdated()
- toLocaleDateString(locale, format)
- toLocaleString(locale, format)
- toLocaleTimeString(locale, format)

## RegExp Objects

### RegExp Prototype Object

#### Function Properties

- exec(string)
- test(string)
- toString()

## Error Objects

### Error Prototype Object

#### Value Properties

- name
- message

#### Function Properties

- toString()

## The JSON Object

### Function Properties

- parse(text [, reviver])
- stringify(value [, replacer [, space]])

QML Global Object ◦ Writing QML Modules